Paper bag forming mechanism

Abstract

The utility model discloses a paper bag forming mechanism which comprises a machine frame, a mold, a mold bottom wall, a supporting wall and a side wall, the machine frame is provided with two sets of lap joint assemblies, an inserting piece, an inserting piece driving assembly, a pressing piece and a pressing driving assembly, and the lap joint assemblies comprise a pressing assembly and a bag twisting assembly. The pressing assembly comprises a pressing piece arranged on the rack and a first driving piece for driving the pressing piece to be close to the supporting wall, and the bag rubbing assembly comprises a suction nozzle laterally located on the outer side of the mold and used for adsorbing the front face of the sheet, a second driving piece for driving the suction nozzle to stretch out or retract and a lifting driving piece for driving the suction nozzle to ascend or descend. The front face of the sheet is driven to integrally move downwards, so that the side split face is driven to move downwards and upwards to achieve lap joint, the overall deformation quantity is provided through relative bending of the bottom of the front face, and therefore the joint of the side split face and the front face is prevented from cracking, and defective products are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of paper bag processing, in particular to a paper bag forming mechanism. Background Art

[0002] In the prior art, the forming of paper bags usually involves taking a sheet with creases for processing, folding the sheet along the creases through a mold, and then folding the bag mouth and overlapping it to form a paper bag. The paper bag processing requires first folding a portion of the sheet inward, and then pressing it down through the mold to make the sheet present a U shape, at this time the inward folded part is at the top position, and finally forming a frame-shaped bag body through folding and overlapping the side faces. For example, a Chinese utility model patent with application number: 202520892558.9 discloses a forming mold for a three-dimensional bag, which is used to provide shape support for the bag body during the process of forming the sheet into the three-dimensional bag. The bag body includes a bottom surface, a pair of front surfaces arranged oppositely in the width direction of the bottom surface, and a pair of side surfaces arranged oppositely in the length direction of the bottom surface. The front surface and the top of each of the side surfaces are formed with a bag mouth folded toward the inside of the bag body;

[0003] wherein at least one of the pair of side surfaces comprises a pair of side facets, opposite ends of the pair of side facets overlap each other, and the bag opening folds at the top of the overlapping portions of the pair of side facets are plugged into each other; and wherein the forming mold comprises a bottom wall, a pair of supporting walls opposite to each other in the width direction, and a pair of side walls opposite to each other in the length direction;

[0004] wherein the bottom wall is adapted to the shape of the bottom surface, the pair of support walls are adapted to the shape of the pair of front surfaces, and the pair of side walls are adapted to the shape of the pair of side surfaces; and the forming mold includes a pair of side surfaces, the tops of the corresponding sides of which are provided with grabbing components that can reciprocate along the height direction of the bag body;

[0005] In which, when the three-dimensional bag is formed, the pair of front faces are bent relative to the bottom face and are respectively close to the pair of support walls, and the pair of side faces are bent relative to the pair of front faces and are respectively close to the pair of side walls of the forming mold. The grabbing component grabs the top of one of the pair of side faces on the corresponding side and moves back and forth along the height direction so that the bag opening folds at the top of the pair of side faces are plugged into each other in the height direction. However, the grabbing component directly grabs the corresponding side face and drives it to move down and up to achieve overlapping. This method only drives the side face of the sheet to move down, which is actually a local movement, and its bottom is not deformed as a whole. Therefore, the corresponding connection is under greater pressure. For example, the junction between the front face and the side face bears most of the pulling force, which causes the position to crack and produce defective products. Utility Model Content

[0006] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a paper bag forming mechanism, which drives the front of the sheet to move downward as a whole, thereby driving the side panels to move downward and upward to achieve overlapping. The overall deformation amount is provided by the relative bending of the bottom of the front, thereby avoiding cracking at the junction of the side panels and the front, and reducing the generation of defective products.

[0007] The utility model discloses a paper bag forming mechanism, comprising a frame, a mold provided on the frame, the mold comprising a bottom wall facing the bottom of a sheet, a support wall facing the front of the sheet, and a side wall corresponding to the side face of the sheet, the frame is provided with a plug for folding the front part of the sheet onto the side wall and a plug driving assembly for driving the plug to retract relatively, the plugs are provided with two groups corresponding to the sheet front, each group of plugs is provided with two corresponding to the sheet front, the frame is provided with a lap assembly for adsorbing the sheet front to descend or ascend, the lap assembly is provided with two groups, the frame A pressing part and a pressing drive assembly for driving the pressing part to retract and retract are provided at the position of the upper corresponding side wall of the mold, and the characteristic is that each set of overlapping assemblies includes a pressing assembly for pressing one front side of the sheet against the supporting wall and a rubbing bag assembly for driving the other front side of the sheet to move downward and upward, the pressing assembly includes a pressing part provided on the frame and a first drive member for driving the pressing part close to the supporting wall, the rubbing bag assembly includes a suction nozzle located on the outside of the mold for adsorbing the front side of the sheet, a second drive member for driving the suction nozzle to extend or retract, and a lifting drive member for driving the suction nozzle to rise or fall.

[0008] The above technical solution is adopted, and when in use, it is assembled on the production line, and a pressure-sensitive adhesive is set at the corresponding position of the sheet. When working, the suction nozzle and the pressing member press the two front sides of the sheet against the supporting wall to prevent the sheet from falling. At this time, the plug-in driving assembly drives the plug-in to extend, so that the front part of the sheet is folded along the crease to the side wall position to form a side surface. At this time, because there are two front sides, there are two side surfaces, one side surface is located on the inside and the other is located on the outside. Because the overlap requires the inner side surface to be pulled down and then pulled up to achieve overlap, the front side adsorbed by the suction nozzle is folded. The folded side surfaces must be located on the inner side. When overlapping the bag opening, the suction nozzle is driven downward by the lifting drive component. Because the distance between the two front sides remains unchanged, the bottom surface of the sheet will change from a plane to an inclined surface, and the difference in deformation will be supplemented by the bending at the bottom of the front side of the sheet to prevent the force from being directly applied between the side surface and the front side, thereby preventing it from cracking. The downward-moving side surface will be aligned with the bag opening of the other side surface on the same side, and it can be driven up again to achieve overlapping. After the overlapping is completed, the pressing plate is driven close to the side wall by the pressing drive component to punch the side surface and the bottom surface on the side wall to make the pressure-sensitive adhesive bonded.

[0009] The utility model is further configured as follows: the lifting drive member includes a first synchronous belt arranged on the frame, a first mounting roller for tensioning the first synchronous belt, and a first driving motor that drives the first synchronous belt to rotate; the second driving member is guided and slid on the frame in a vertical direction, and a mounting plate is connected to the output end of the second driving member; the first synchronous belt is provided with a first vertical section arranged in a vertical direction; the inner side of the mounting plate corresponding to the first vertical section is also provided with meshing teeth for engaging with the inner side of the first synchronous belt; and the suction nozzle is located on the mounting plate; when the suction nozzle is extended and adsorbed on the front side of the sheet, the meshing teeth engage with the inner side of the first vertical section; and each first mounting roller is rotatably provided with a first transmission gear that meshes with the first synchronous belt.

[0010] By adopting the above technical solution, when the second driving member works to drive the mounting plate to extend, the meshing teeth can engage with the inner side of the first vertical section, and drive the suction nozzle to fit the front position of the sheet, and the front of the sheet can be adsorbed by the suction nozzle to prevent the sheet from falling. At the same time, when the first driving motor works, it can drive the first synchronous belt for transmission. Since the meshing teeth engage with the inner side of the first vertical section, the mounting plate can be driven to rise and fall, and its structural layout is relatively reasonable.

[0011] The present invention is further configured as follows: a buffer cylinder is provided on the frame, and the second driving member is provided on the output shaft of the buffer cylinder.

[0012] With the above technical solution, since the meshing teeth are not always aligned with the teeth on the inner side of the first synchronous belt, when the meshing teeth approach the first synchronous belt, if there is a misalignment and they cannot engage in time, they will slip. By using this solution to set the pressure inside the buffer cylinder, the mounting plate can have an avoidance space for moving up and down, so that when the second driving member drives the mounting plate to extend, it can adaptively adjust to engage with the inner teeth of the first synchronous belt, which can play a guiding role and a buffering and avoidance effect. Of course, the buffer cylinder can also be replaced by a slider and an elastic member.

[0013] The utility model is further configured as follows: the clamping member includes a second synchronous belt, the first driving member is a second driving motor, a second mounting roller is provided on the frame, the second synchronous belt is wound around the second mounting roller, the second synchronous belt has a second vertical section distributed along the vertical direction, the outer side of the second vertical section can be moved to press the front side of the sheet against the support wall, and each second mounting roller is rotatably provided with a second transmission gear that meshes with the second synchronous belt.

[0014] By adopting the above technical solution, when the sheets are overlapped to form a frame-shaped bag, the bag is easily put on the mold and cannot fall off automatically. The first drive motor and the second drive motor can drive the frame-shaped bag to move downward, thereby achieving fast and accurate blanking.

[0015] The utility model is further configured as follows: the insert is located on one side of the supporting wall and can extend relatively to the side wall position; the insert driving assembly includes a conveyor belt and a slider fixed on the conveyor belt; a slide rail is provided on the frame; the slider guides and slides on the slide rail; and a mounting seat is also provided on the slider; the insert is provided on the mounting seat.

[0016] By adopting the above technical solution, the conveyor belt can drive the slider to slide on the slide rail, thereby driving the mounting seat to slide, so that the insert is more stable during movement.

[0017] Further configuration of the present invention: the pressing part is an inverted T-shaped pressing plate, a slide is provided on the frame for guiding sliding, the pressing plate is arranged on the slide, the pressing drive assembly includes a third driving motor, an eccentric wheel rotatably arranged on the output shaft of the third driving motor, and a transmission arm arranged on the eccentric wheel, one end of the transmission arm is hinged to the slide, and the other end is hinged to the eccentric wheel.

[0018] By adopting the above technical solution, the inverted T-shaped pressing plate can just punch the pressure-sensitive adhesive on the side surface and bottom surface of the sheet to make it sticky, thereby achieving the effect of adhesion and anti-slippage, and it is driven by an eccentric wheel and a transmission arm, which is not only powerful but also relatively fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model when rubbing the bag;

[0020] Figure 2 It is a partial structural diagram of the utility model;

[0021] Figure 3 This is a diagram showing the coordination of the components such as the pressing assembly of the present utility model;

[0022] Figure 4 This is a diagram showing the coordination of parts such as the bag-rubbing assembly of the utility model;

[0023] Figure 5 This is the matching diagram of the mold and sheet material of the utility model;

[0024] Figure 6 This is a schematic diagram of the sheet state in the bag-rubbing state of the utility model;

[0025] Figure 7 This is a schematic diagram of the bag body when the utility model is successfully overlapped;

[0026] Figure 8 This is a diagram showing the cooperation between the press-fitting part and the press-fitting drive assembly of the present invention;

[0027] Figure 9 This is a diagram showing the matching of the insert and insert drive assembly of the utility model. DETAILED DESCRIPTION

[0028] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings:

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] The utility model discloses a paper bag forming mechanism, comprising a frame 1, a mold 2 is provided on the frame 1, the mold 2 comprises a bottom wall facing the bottom of a sheet (the bottom wall is not shown in the figure), a support wall 21 facing the front of the sheet and a side wall 22 corresponding to the side face of the sheet, the frame 1 is provided with a plug 20 for folding the front part of the sheet onto the side wall 22 and a plug driving assembly 30 for driving the plug to retract relatively, the plug 20 is provided with two groups, each group of plugs 20 is provided with two corresponding to the front of the sheet, the frame 1 is provided with a lap joint assembly 3 for adsorbing the front of the sheet to descend or rise, the lap joint assembly 3 is provided with two groups, because both sides of the sheet need to be overlapped, so the lap joint assembly 3 needs two groups and works simultaneously, only one group is shown in the drawings of the specification, and the other group has the same structure as the side wall 22 of the mold 2 on the frame 1 A pressing part 40 and a pressing drive assembly 50 for driving the pressing part 40 to retract and retract are provided at the position. In the embodiment of the present utility model, each group of overlapping assemblies 3 includes a pressing assembly 31 for pressing one front side of the sheet on the support wall 21 and a rubbing bag assembly 32 for driving the other front side of the sheet to move downward and upward. The pressing assembly 31 includes a pressing part 311 provided on the frame 1 and a first driving member 312 for driving the pressing part 311 close to the support wall 21 (the first driving member 312 is most preferably a motor and a screw, the pressing part 311 is provided on the mounting plate, and is driven to slide laterally by threaded engagement), the rubbing bag assembly 32 includes a suction nozzle 321 located on the outside of the mold 2 for adsorbing the front side of the sheet, a second driving member 322 for driving the suction nozzle 321 to extend or retract, and a lifting driving member 323 for driving the suction nozzle 321 to rise or fall.

[0031] When the above technical solution is adopted, it is assembled on the production line and pressure-sensitive adhesive is set on the corresponding position of the sheet. When working, the suction nozzle 321 and the pressing member 311 press the two front sides of the sheet against the support wall 21 to prevent the sheet from falling. At this time, the insert 20 is extended by the insert driving assembly 30, so that the front part of the sheet is folded along the crease to the side wall position to form a side surface. At this time, because there are two front sides, there are two side surfaces, one side surface is located on the inside and the other is located on the outside. Because the overlap requires the inner side surface to be pulled down and then pulled up to achieve overlap, the front side adsorbed by the suction nozzle 321 The folded side surface must be located on the inner side. When overlapping the bag opening, the suction nozzle 321 is driven downward by the lifting drive member 323. Because the distance between the two front sides remains unchanged, the bottom surface of the sheet will change from a plane to an inclined surface, and the difference in deformation will be supplemented by the bending at the bottom of the front side of the sheet to prevent the force from being directly applied between the side surface and the front side, thereby preventing it from cracking. The downward-moving side surface will be aligned with the other side surface bag opening on the same side, and it can be driven up again to achieve overlapping. After the overlapping is completed, the pressing plate is driven close to the side wall 22 by the pressing drive assembly 50 and the side surface and the bottom surface on the side wall 22 are punched to make the pressure-sensitive adhesive bonded.

[0032] The lifting drive member 323 includes a first synchronous belt 3231 provided on the frame 1, a first mounting roller 3232 for tensioning the first synchronous belt 3231, and a first driving motor 3233 that drives the first synchronous belt 3231 to rotate. The second driving member 322 slides on the frame 1 along the vertical direction and the output end of the second driving member 322 is connected to a mounting plate 4. The first synchronous belt 3231 is provided with a first vertical section 5 provided along the vertical direction. The inner side of the mounting plate 4 corresponding to the first vertical section 5 is also provided with meshing teeth 41 for engaging with the inner side of the first synchronous belt 3231, and the suction nozzle 321 is located on the mounting plate 4. When the suction nozzle 321 is extended and adsorbed on the front side of the sheet When the second driving member 322 is working, the meshing teeth 41 mesh with the inner side of the first vertical section 5, and each first mounting roller 3232 is rotatably provided with a first transmission gear 6 meshing with the first synchronous belt 3231. When the second driving member 322 works to drive the mounting plate 4 to extend, the meshing teeth 41 can mesh with the inner side of the first vertical section 5, and drive the suction nozzle 321 to fit the front position of the sheet, and the suction nozzle 321 works to adsorb the front side of the sheet to prevent the sheet from falling. At the same time, when the first driving motor 3233 is working, it can drive the first synchronous belt 3231 for transmission. Since the meshing teeth 41 mesh with the inner side of the first vertical section 5, the mounting plate 4 can be driven to rise and fall, and its structural layout is relatively reasonable.

[0033] The frame 1 is provided with a buffer cylinder 7, and the second driving member 322 is provided on the output shaft of the buffer cylinder 7. Because the meshing teeth 41 are not always aligned with the teeth on the inner side of the first synchronous belt 3231, when the meshing teeth 41 are close to the first synchronous belt 3231, if there is a misalignment and it cannot engage in time, it will slip. The pressure inside the buffer cylinder 7 can be set by adopting this scheme, so that the mounting plate 4 has an avoidance space for moving up and down, so that when the second driving member 322 drives the mounting plate 4 to extend, it can be adaptively adjusted to engage with the inner teeth of the first synchronous belt 3231, which can play a guiding role and a buffering and avoidance effect. Of course, the buffer cylinder 7 can also be replaced by a slider and an elastic member.

[0034] The clamping member 311 includes a second synchronous belt 3111, the first driving member 312 is a second driving motor, and a second mounting roller 8 is provided on the frame 1. The second synchronous belt 3111 is wound around the second mounting roller 8. The second synchronous belt 3111 has a second vertical section 9 distributed in the vertical direction. The outer side of the second vertical section 9 can be moved to press the front of the sheet on the support wall 21. Each second mounting roller 8 is rotatably provided with a second transmission gear 10 that meshes with the second synchronous belt 3111. When the sheets are overlapped to form a frame-shaped bag body, the bag body is easily put on the mold 2 and cannot fall off automatically. The first driving motor 3233 and the second driving motor can drive the frame-shaped bag body to move downward, thereby realizing fast and accurate blanking.

[0035] The insert 20 is located on one side of the support wall 21 and can extend relatively to the side wall 22. The insert driving assembly 30 includes a conveyor belt 301 and a slider 302 fixed on the conveyor belt 301. A slide rail 303 is provided on the frame 1. The slider 302 slides on the slide rail 303, and the slider 302 is also provided with a mounting seat 304. The insert 20 is provided on the mounting seat 304. The conveyor belt 301 can drive the slider 302 to slide on the slide rail 303, thereby driving the mounting seat 304 to slide, so that the insert 20 is more stable during movement. It is most preferred that a sensor is also provided on the frame 1 for detecting the position of the mounting seat 304 to facilitate control of its start and stop.

[0036] The pressing part 40 is an inverted T-shaped pressing plate, and a slide 60 is provided on the frame 1 for guiding sliding. The pressing plate is arranged on the slide 60. The pressing drive assembly 50 includes a third driving motor 501, an eccentric wheel 502 rotatably arranged on the output shaft of the third driving motor 501, and a transmission arm 503 arranged on the eccentric wheel 502. One end of the transmission arm 503 is hinged to the slide 60, and the other end is hinged to the eccentric wheel 502. The inverted T-shaped pressing plate can just punch the pressure-sensitive adhesive on the side surface and bottom surface of the sheet to make it sticky, thereby achieving the effect of adhesion and anti-slippage, and is driven by the eccentric wheel 502 and the transmission arm 503, which is not only powerful but also relatively fast.

Claims

1. A paper bag forming mechanism, comprising a frame (1) and a mold (2), wherein the mold (2) comprises a bottom wall facing the bottom surface of a sheet, a support wall (21) facing the front surface of the sheet, and a side wall (22) corresponding to the side surface of the sheet, the frame (1) is provided with an insert (20) for folding the front surface of the sheet onto the side wall (22), and an insert driving assembly (30) for driving the insert (20) to relatively retract, the insert (20) being provided in two groups, each group of inserts (20) being provided with two corresponding to the front surface of the sheet, the frame (1) being provided with a lap assembly (3) for adsorbing the front surface of the sheet to descend or ascend, the lap assembly (3) being provided in two groups, a pressing member (40) and a pressing driving assembly (50) for driving the pressing member (40) to retract at a position corresponding to the side wall (22) of the mold (2), characterized in that: Each set of overlapping components (3) includes a pressing component (31) for pressing one front side of the sheet material onto the supporting wall (21) and a rubbing bag component (32) for driving the other front side of the sheet material to move downward and upward, the pressing component (31) includes a pressing member (311) provided on the frame (1) and a first driving member (312) for driving the pressing member (311) to approach the supporting wall (21), and the rubbing bag component (32) includes a suction nozzle (321) located on the outside of the mold (2) for sucking the front side of the sheet material, a second driving member (322) for driving the suction nozzle (321) to extend or retract, and a lifting driving member (323) for driving the suction nozzle (321) to rise or fall.

2. A paper bag forming mechanism according to claim 1, characterized in that: The lifting drive member (323) includes a first synchronous belt (3231) provided on the frame (1), a first mounting roller (3232) for tensioning the first synchronous belt (3231), and a first driving motor (3233) for driving the first synchronous belt (3231) to rotate. The second driving member (322) is guided and slid on the frame (1) in a vertical direction, and a mounting plate (4) is connected to the output end of the second driving member (322). The first synchronous belt (3231) is provided with a roller in a vertical direction. A first vertical section (5) is provided, and the inner side of the mounting plate (4) corresponding to the first vertical section (5) is further provided with meshing teeth (41) for meshing with the inner side of the first synchronous belt (3231), and the suction nozzle (321) is located on the mounting plate (4). When the suction nozzle (321) is extended and adsorbed on the front side of the sheet, the meshing teeth (41) mesh with the inner side of the first vertical section (5), and each first mounting roller (3232) is rotatably provided with a first transmission gear (6) meshing with the first synchronous belt (3231).

3. A paper bag forming mechanism according to claim 2, characterized in that: A buffer cylinder (7) is provided on the frame (1), and a second driving member (322) is provided on an output shaft of the buffer cylinder (7).

4. A paper bag forming mechanism according to claim 1, 2 or 3, characterized in that: The pressing member (311) includes a second synchronous belt (3111), the first driving member (312) is a second driving motor, a second mounting roller (8) is provided on the frame (1), the second synchronous belt (3111) is wound around the second mounting roller (8), the second synchronous belt (3111) has a second vertical section (9) distributed along the vertical direction, the outer side of the second vertical section (9) is movable to press the front side of the sheet against the supporting wall (21), and each second mounting roller (8) is rotatably provided with a second transmission gear (10) meshing with the second synchronous belt (3111).

5. A paper bag forming mechanism according to claim 1, 2 or 3, characterized in that: The insert (20) is located on one side of the support wall (21) and can extend relatively to the side wall (22). The insert drive assembly (30) includes a conveyor belt (301) and a slider (302) fixed on the conveyor belt (301). A slide rail (303) is provided on the frame (1). The slider (302) slides on the slide rail (303) and a mounting seat (304) is further provided on the slider (302). The insert (20) is provided on the mounting seat (304).

6. A paper bag forming mechanism according to claim 1, 2 or 3, characterized in that: The pressing part (40) is an inverted T-shaped pressing plate, a slide seat (60) is provided on the frame (1) for guiding sliding movement, and the pressing plate is arranged on the slide seat (60), and the pressing drive assembly (50) includes a third driving motor (501), an eccentric wheel (502) rotatably arranged on the output shaft of the third driving motor (501), and a transmission arm (503) arranged on the eccentric wheel (502), one end of the transmission arm (503) is hinged to the slide seat (60), and the other end is hinged to the eccentric wheel (502).

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